Other scientists note that boosting the body's defenses is just one of many vital functions of sleep. (discovermagazine.com)
On the other hand, if you don't eat enough cholesterol, your body simply produces more since cholesterol has dozens of important vital functions in the body. (thebettyrocker.com)
In exchange for a home, these microbes perform vital functions for their hosts, protecting them from pathogens, processing food, and even altering social behavior. (quantamagazine.org)